CMSIS DSP Software Library: arm_signal_converge_example_f32.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_signal_converge_example_f32.c Go to the documentation of this file.00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 29. November 2010 00005 * $Revision: V1.0.3 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_signal_converge_example_f32.c 00009 * 00010 * Description: Example code demonstrating convergence of an adaptive 00011 * filter. 00012 * 00013 * Target Processor: Cortex-M4/Cortex-M3 00014 * 00015 * 00016 * Version 1.0.3 2010/11/29 00017 * Re-organized the CMSIS folders and updated documentation. 00018 * 00019 * Version 1.0.1 2010/10/05 KK 00020 * Production release and review comments incorporated. 00021 * 00022 * Version 1.0.0 2010/09/20 KK 00023 * Production release and review comments incorporated. 00024 * ------------------------------------------------------------------- */ 00025 00093 #include "arm_math.h" 00094 #include "math_helper.h" 00095 00096 /* ---------------------------------------------------------------------- 00097 ** Global defines for the simulation 00098 * ------------------------------------------------------------------- */ 00099 00100 #define TEST_LENGTH_SAMPLES 1536 00101 #define NUMTAPS 32 00102 #define BLOCKSIZE 32 00103 #define DELTA_ERROR 0.000001f 00104 #define DELTA_COEFF 0.0001f 00105 #define MU 0.5f 00106 00107 #define NUMFRAMES (TEST_LENGTH_SAMPLES / BLOCKSIZE) 00108 00109 /* ---------------------------------------------------------------------- 00110 * Declare FIR state buffers and structure 00111 * ------------------------------------------------------------------- */ 00112 00113 float32_t firStateF32[NUMTAPS + BLOCKSIZE]; 00114 arm_fir_instance_f32 LPF_instance; 00115 00116 /* ---------------------------------------------------------------------- 00117 * Declare LMSNorm state buffers and structure 00118 * ------------------------------------------------------------------- */ 00119 00120 float32_t lmsStateF32[NUMTAPS + BLOCKSIZE]; 00121 float32_t errOutput[TEST_LENGTH_SAMPLES]; 00122 arm_lms_norm_instance_f32 lmsNorm_instance; 00123 00124 00125 /* ---------------------------------------------------------------------- 00126 * Function Declarations for Signal Convergence Example 00127 * ------------------------------------------------------------------- */ 00128 00129 arm_status test_signal_converge_example( void ); 00130 00131 00132 /* ---------------------------------------------------------------------- 00133 * Internal functions 00134 * ------------------------------------------------------------------- */ 00135 arm_status test_signal_converge(float32_t* err_signal, 00136 uint32_t blockSize); 00137 00138 void getinput(float32_t* input, 00139 uint32_t fr_cnt, 00140 uint32_t blockSize); 00141 00142 /* ---------------------------------------------------------------------- 00143 * External Declarations for FIR F32 module Test 00144 * ------------------------------------------------------------------- */ 00145 extern float32_t testInput_f32[TEST_LENGTH_SAMPLES]; 00146 extern float32_t lmsNormCoeff_f32[32]; 00147 extern const float32_t FIRCoeff_f32[32]; 00148 extern arm_lms_norm_instance_f32 lmsNorm_instance; 00149 00150 /* ---------------------------------------------------------------------- 00151 * Declare I/O buffers 00152 * ------------------------------------------------------------------- */ 00153 00154 float32_t wire1[BLOCKSIZE]; 00155 float32_t wire2[BLOCKSIZE]; 00156 float32_t wire3[BLOCKSIZE]; 00157 float32_t err_signal[BLOCKSIZE]; 00158 00159 /* ---------------------------------------------------------------------- 00160 * Signal converge test 00161 * ------------------------------------------------------------------- */ 00162 00163 int32_t main(void) 00164 { 00165 uint32_t i; 00166 arm_status status; 00167 uint32_t index; 00168 float32_t minValue; 00169 00170 /* Initialize the LMSNorm data structure */ 00171 arm_lms_norm_init_f32(&lmsNorm_instance, NUMTAPS, lmsNormCoeff_f32, lmsStateF32, MU, BLOCKSIZE); 00172 00173 /* Initialize the FIR data structure */ 00174 arm_fir_init_f32(&LPF_instance, NUMTAPS, (float32_t *)FIRCoeff_f32, firStateF32, BLOCKSIZE); 00175 00176 /* ---------------------------------------------------------------------- 00177 * Loop over the frames of data and execute each of the processing 00178 * functions in the system. 00179 * ------------------------------------------------------------------- */ 00180 00181 for(i=0; i < NUMFRAMES; i++) 00182 { 00183 /* Read the input data - uniformly distributed random noise - into wire1 */ 00184 arm_copy_f32(testInput_f32 + (i * BLOCKSIZE), wire1, BLOCKSIZE); 00185 00186 /* Execute the FIR processing function. Input wire1 and output wire2 */ 00187 arm_fir_f32(&LPF_instance, wire1, wire2, BLOCKSIZE); 00188 00189 /* Execute the LMS Norm processing function*/ 00190 00191 arm_lms_norm_f32(&lmsNorm_instance, /* LMSNorm instance */ 00192 wire1, /* Input signal */ 00193 wire2, /* Reference Signal */ 00194 wire3, /* Converged Signal */ 00195 err_signal, /* Error Signal, this will become small as the signal converges */ 00196 BLOCKSIZE); /* BlockSize */ 00197 00198 /* apply overall gain */ 00199 arm_scale_f32(wire3, 5, wire3, BLOCKSIZE); /* in-place buffer */ 00200 } 00201 00202 status = ARM_MATH_SUCCESS; 00203 00204 /* ------------------------------------------------------------------------------- 00205 * Test whether the error signal has reached towards 0. 00206 * ----------------------------------------------------------------------------- */ 00207 00208 arm_abs_f32(err_signal, err_signal, BLOCKSIZE); 00209 arm_min_f32(err_signal, BLOCKSIZE, &minValue, &index); 00210 00211 if (minValue > DELTA_ERROR) 00212 { 00213 status = ARM_MATH_TEST_FAILURE; 00214 } 00215 00216 /* ---------------------------------------------------------------------- 00217 * Test whether the filter coefficients have converged. 00218 * ------------------------------------------------------------------- */ 00219 00220 arm_sub_f32((float32_t *)FIRCoeff_f32, lmsNormCoeff_f32, lmsNormCoeff_f32, NUMTAPS); 00221 00222 arm_abs_f32(lmsNormCoeff_f32, lmsNormCoeff_f32, NUMTAPS); 00223 arm_min_f32(lmsNormCoeff_f32, NUMTAPS, &minValue, &index); 00224 00225 if (minValue > DELTA_COEFF) 00226 { 00227 status = ARM_MATH_TEST_FAILURE; 00228 } 00229 00230 /* ---------------------------------------------------------------------- 00231 * Loop here if the signals did not pass the convergence check. 00232 * This denotes a test failure 00233 * ------------------------------------------------------------------- */ 00234 00235 if( status != ARM_MATH_SUCCESS) 00236 { 00237 while(1); 00238 } 00239 } 00240  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:57 for CMSIS DSP Software Library by  1.7.2